DHNAK messages in instance while trying to renew DHCP lease in Red Hat OpenStack Platform with nova networking

Solution In Progress - Updated -

Issue

  • Why DHNAK messages are reported in instance message file while trying to renew DHCP lease?
  • Following messages reported on compute node during the same time.
Mar  1 06:48:53 compute-node dnsmasq-dhcp[25467]: DHCPREQUEST(vlan100) 192.168.0.10 aa:aa:aa:aa:aa:aa
Mar  1 06:48:53 compute-node dnsmasq-dhcp[25467]: DHCPNAK(vlan100) 192.168.0.10 aa:aa:aa:aa:aa:aa lease not found
Mar  1 06:48:53 compute-node dnsmasq-dhcp[25467]: DHCPDISCOVER(vlan100) aa:aa:aa:aa:aa:aa
Mar  1 06:48:53 compute-node dnsmasq-dhcp[25467]: DHCPOFFER(vlan100) 192.168.0.10 aa:aa:aa:aa:aa:aa
Mar  1 06:48:53 compute-node dnsmasq-dhcp[25467]: DHCPREQUEST(vlan100) 192.168.0.10 aa:aa:aa:aa:aa:aa
Mar  1 06:48:53 compute-node dnsmasq-dhcp[25467]: DHCPACK(vlan100) 192.168.0.10 aa:aa:aa:aa:aa:aa instance
  • In RHEL 6 and RHEL 7 instances, this leads to a loss of static routes which are configured in /etc/sysconfig/network-scripts/routes-<NIC>

Environment

  • Red Hat OpenStack Platform 5.0 on RHEL 7
  • nova network with linux bridges

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In
Close

Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.